Learning Forum

[keyurckp]

How can i define a material to behave as elasto-plastic in fracture mechanics simulation? Also which material parameters do i need to define for elasto-plastic fracture mechanics simulation?

 

[Sandeep Medikonda]

Hi Keyur,

Please refer to these resources from our channel partners and from the help.

Resource 1

Resource 2

Resource 3

Resource 4

Regards,
Sandeep
Guidelines on the Student Community

[keyurckp]

The link that you send is sufficient but now i had a different problem. Initially i thought that you will suggest something that can be done in ansys workbench but now can you send similar materials as above form where i can get the meaning of each APDL command used in ansys? so that i can finish off my work with APDL commands as i do not know the meaning of those commands.

[Sandeep Medikonda]

You can refer to the Command Reference in the help.

[keyurckp]

Sir i am a student and i am using the license of the institute in which i study so i will not be able to use your above link.

[jj77]

Go to the ansys help (on the main menu on the top and right on the GUI) say on mechanical wb.

 

That will launch the ansys help browser.

 

Copy and paste this link into the ansys help browser:

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v192/ans_cmd/Hlp_C_CmdTOC.html

 

[keyurckp]

Instead you can tell me what to type in mechanical wb help as the link shows the same page as sandeep mentioned above

[jj77]

Perhaps command reference or something like that.

 

[keyurckp]

ya i am using ansys 16.2 so help option is different in my case

[Sandeep Medikonda]

Keyur, please upgrade to the latest version all you would have to do is click on the banner at the top which says download software. The link method works for v19 or later. See here.

If you are in v16.2, you should have help already installed. So, go to the Command Reference in Mechanical APDL manual.

[David Weed]

Hi Keyur,

Regarding your initial question, you can use a plasticity model in conjunction with fracture capabilities in ANSYS Mechanical provided that you use the J-Integral approach for evaluating the initial crack (you can use pre-meshed, arbitrary, or semi-elliptical crack objects to define this). You will also need to define your plasticity model in Engineering Data. Also, make sure that you have Large Deflection set to 'On' in the Solver Controls, which is under Analysis Settings. Overall, there should be no need for APDL commands as everything you expressed you needed is available via the GUI.

[keyurckp]

Hi David,

I am really satisfied with you answer but i had a further doubt that what if the plastic model that i want to use or fracture model i want to use is not present in the data base in that case how can i add a user defined model as i have no experience with apdl commands can you put a link where i can start from initial and model a plasticity and fracture model all by myself

[David Weed]

Hi Keyur,

There is the option of using a User Programmed model via usermat. If you search the help documentation on this, you will see an example of a bilinear isotropic hardening model programmed in Fortran. You can use that as a template to write your model code. Also note that you will need access to an Intel Fortran compiler as well as Microsoft Visual studio to compile and link your code to MAPDL.

[keyurckp]

I have tried most of the methods like smart crack growth, XFEM and VCCT for interface delamination (not sure about CZM) and in most of the cases i found that the method is applied for linear elastic materials. So is there any method in ansys software that captures plastic deformation along with fracture propagation? please suggest and share any link towards this topic or should i try for any other software like abaqus or comsol. 

[Karan]

Hello DavidW,

I just found your comment related to my work. As I was also working to make a new plasticity model but facing problem in getting Fortran 14.0.3 Compiler as I am using Ansys 16.2 version. If possible can you tell me If I use other version of Fortran is my asnsys 16.2 going to accept it or not.

Also, tell me how to download this version. If you know any sources from where I can download this as a student version.

It will be a great help If I just got an answer to my problem. As I just got stuck in this problem and unable to move forward.

Waiting for reply!

Thank You

 

[peteroznewman]

Karan, please copy your text above and start a New Discussion. It is more likely that David W will see it.  Then you can delete the post above.

[Karan]

Thanks, @peteroznewman for your kind reply. Sorry for the delay from my side. I will make a new discussion regarding my problem.